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INCOME TAXES - Components of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets    
Tax credits and loss carryforwards $ 657 $ 1,710
Accrued liabilities 7,285 6,629
Incentive compensation 12,132 13,867
Other 6,747 2,852
Deferred tax assets, gross 26,821 25,058
Deferred tax liabilities    
Property, plant and equipment (14,695) (12,813)
Intangibles (42,343) (45,960)
Other (3,841) (2,003)
Deferred tax liability (60,879) (60,776)
Net deferred tax asset before valuation allowances and reserves (34,058) (35,718)
Valuation allowances (847) (1,237)
Net deferred tax asset or liability $ (34,905) $ (36,955)